U.S. patent number 5,065,476 [Application Number 07/571,291] was granted by the patent office on 1991-11-19 for handle arrangement for a handheld portable tool.
This patent grant is currently assigned to Andreas Stihl. Invention is credited to Hans-Peter Dohse, Jochen Kramer.
United States Patent |
5,065,476 |
Dohse , et al. |
November 19, 1991 |
Handle arrangement for a handheld portable tool
Abstract
The invention is directed to a rearward handle arrangement for a
handheld portable tool defining a horizontal axis and having a
motor housing and a forward handle fixedly attached to the housing
so as to permit two-handed operation of the tool by an operator.
The rearward handle arrangement includes: a carrier part for
attaching the rearward handle arrangement to the housing of the
tool; a rearward handle; and, a bearing journal for rotatably
journalling the rearward handle in the carrier part so as to permit
the rearward handle to rotate about the horizontal axis relative to
the carrier part and the forward handle. The carrier part and the
reaward handle conjointly define an interface and an unlatchable
detent is disposed at this interface for self-latching the rearward
handle on the carrier part at any one of a plurality of
predetermined angular positions about the horizontal axis. These
angular positions correspond to respective work positions in which
the tool can be held by the operator.
Inventors: |
Dohse; Hans-Peter
(Rommelshausen, DE), Kramer; Jochen (Stuttgart,
DE) |
Assignee: |
Stihl; Andreas (Waiblingen,
DE)
|
Family
ID: |
25884901 |
Appl.
No.: |
07/571,291 |
Filed: |
August 23, 1990 |
Foreign Application Priority Data
|
|
|
|
|
Sep 8, 1989 [DE] |
|
|
3929881 |
Jul 4, 1990 [DE] |
|
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4021277 |
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Current U.S.
Class: |
16/426; 16/422;
30/383; 173/170; 451/340 |
Current CPC
Class: |
B25F
5/02 (20130101); B27B 17/0008 (20130101); B24B
23/00 (20130101); B24B 55/00 (20130101); Y10T
16/469 (20150115); Y10T 16/4713 (20150115) |
Current International
Class: |
B24B
55/00 (20060101); B24B 23/00 (20060101); B25F
5/00 (20060101); B25F 5/02 (20060101); B27B
17/00 (20060101); B27B 017/02 () |
Field of
Search: |
;16/114R,11R
;30/500,519,383,381 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Spruill; Robert L.
Assistant Examiner: Cuda; Carmine
Attorney, Agent or Firm: Ottesen; Walter
Claims
What is claimed is:
1. A rearward handle arrangement for a handheld portable tool
having a motor housing holding a motor and a forward handle fixedly
attached to the housing so as to permit two-handed operation of the
tool by an operator, the tool defining a horizontal axis and the
rearward handle arrangement comprising:
a carrier part for attaching the rearward handle arrangement to the
housing of the tool;
a rearward handle;
journalling means for rotatably journalling said rearward handle in
said carrier part so as to permit said rearward handle to rotate
about said axis relative to said carrier part and said forward
handle;
said carrier part and said rearward handle conjointly defining an
interface; and,
unlatchable detent means disposed at said interface for
self-latching said rearward handle to said carrier part at any one
of a plurality of predetermined angular positions about said axis
and corresponding to respective work positions in which the tool
can be held by the operator.
2. The rearward handle arrangement of claim 1, said detent means
including a detent pawl pivotally journalled in said rearward
handle; a plurality of recesses formed in said carrier part
defining respective ones of said work positions; said detent pawl
having a projection formed thereon for engaging one of said
recesses when said rearward handle is rotated about said axis into
one of said work positions; and, resilient biasing means for
resiliently biasing said detent pawl toward said recesses.
3. The rearward handle arrangement of claim 1, said detent means
including passage means formed in said rearward handle and defining
a passage axis; recess means formed in said carrier part; a detent
wedge mounted in said passage means so as to be displaceable along
said passage axis for engaging said recess means; and, resilient
biasing means for resiliently biasing said detent wedge toward said
recess means.
4. The rearward handle arrangement of claim 1, actuator means
movably mounted in said rearward handle so as to be movable between
first and second actuator positions corresponding to a standstill
condition of the work tool and an operating condition of the work
tool, respectively; and, said actuator means including safety hold
means for blocking said detent means in the latched condition so
long as said actuator means is out of said first actuator position
and for permitting movement of said actuator means between said
actuator positions so long as said detent means is in the latched
condition.
5. The rearward handle arrangement of claim 4, said detent means
including: a detent pawl pivotally journalled in said rearward
handle; and, a plurality of recesses formed in said carrier part
defining respective ones of said work positions; said detent pawl
having a projection formed thereon for engaging one of said
recesses when said rearward handle is rotated about said axis into
one of said work positions; and, resilient biasing means for
resiliently biasing said detent pawl toward said recesses; said
actuator means being a throttle lever pivotally mounted on said
rearward handle for pivoting through a pivot range between said
first and second actuator positions; said throttle lever having a
forward portion which traces a first path of movement as said
throttle lever moves between said first and second actuator
positions; said detent pawl being pivotally movable for tracing a
second path of movement between a latched position wherein said
projection is in one of said recesses and an unlatched position;
and, said throttle lever and said detent pawl being mounted in said
rearward handle so as to cause said first and second paths to cross
over each other.
6. The rearward handle arrangement of claim 4, said detent means
including passage means formed in said rearward handle and defining
a passage axis; recess means formed in said carrier part; a detent
wedge mounted in said passage means so as to be displaceable along
said passage axis for engaging said recess means; and, resilient
biasing means for resiliently biasing said detent wedge toward said
recess means; said actuator means being a throttle lever pivotally
mounted on said rearward handle for pivoting through a pivot range
between said first and second actuator positions; said throttle
lever having a forward portion which traces a first path of
movement as said throttle lever moves between said first and second
actuator positions; said detent wedge having a bracket formed
thereon and being slideably movable between a latched position
wherein said detent wedge is in one of said recesses and an
unlatched position so as to cause said bracket to trace a second
path of movement; and, said throttle lever and said detent wedge
being mounted in said rearward handle so as to cause said first and
second paths to cross over each other.
7. The rearward handle arrangement of claim 1, said journalling
means including an annular portion formed on said carrier part;
and, a substantially cylindrical extension formed on said rearward
handle and being rotatably journalled in said annular portion.
8. The rearward handle arrangement of claim 7, said extension
having a radial projection formed thereon for engaging behind said
annular portion when said extension is inserted into said annular
portion.
9. The rearward handle arrangement of claim 7, said annular portion
having a transverse bore formed therein and said extension having
an annular slot formed therein; and, said handle arrangement
further comprising a holding pin for engaging said slot and said
bore for holding said rearward handle on said carrier part.
10. The rearward handle arrangement of claim 7, said handle having
a throttle lever pivotally mounted thereon and said motor being a
gasoline engine having a throttle pull wire and said extension
having guide means formed thereon for guiding said wire
therethrough.
11. The rearward handle arrangement of claim 7, said rearward
handle including two handle shells conjointly defining a partition
interface extending in the direction of said axis and
asymmetrically through said cylindrical extension so as to cause
said cylindrical extension to have a main segment and a
complementary segment.
12. The rearward handle arrangement of claim 11, said main segment
having an outer end; and, said cylindrical extension having a
radial projection formed on said end of said main segment; said
radial projection being formed on said end so as to extend
arcuately for engaging behind said annular portion when said
extension is inserted into said annular portion.
13. The rearward handle arrangement of claim 12, said carrier part
having an arcuate segment formed thereon to define a stop face for
receiving said radial projection thereagainst when said main
segment is rotated in said annular portion thereby limiting the
angle through which said main segment can be rotated in said
annular portion.
14. The rearward handle arrangement of claim 11, said handle having
a throttle lever pivotally mounted thereon and the motor being a
gasoline engine having a throttle pull wire connected to the
throttle lever; said main segment having a wall formed therein at
right angles to said axis for defining a guide for the throttle
pull wire.
15. The rearward handle arrangement of claim 1, said angular
positions being spaced at 90.degree. from each other.
16. The rearward handle arrangement of claim 1, said rearward
handle having a top wall and said handle arrangement further
comprising a stop switch mounted in said wall so as to be centered
on said handle.
Description
FIELD OF THE INVENTION
The invention relates to a handle arrangement for a handheld
portable tool having two handles for enabling an operator to hold
and manipulate the tool with both hands.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 4,785,540 discloses a handheld portable tool having
two handles for enabling an operator to guide the tool with both
hands. The forward handle is journalled on the motor housing in
such a manner that it is pivotable to the left and to the right
about the longitudinal axis of the tool. The rearward handle is
fixedly connected to the motor housing and contains a throttle
lever for controlling the rotational speed of the drive motor.
Because of the pivotability of the forward handle, this handle can
be displaced into different working positions in correspondence to
work requirements such as horizontal and vertical cuts as well as
enabling the operator to work with the tool at hip height or above
the head.
However, it is a disadvantage in this known arrangement that the
position of the actuating lever and switch are also displaced when
displacing the handle so that a sensitive actuation of the throttle
lever or a rapid actuation of the stop switch cannot be assured in
all operating positions. Furthermore, the known arrangement has no
definite work positions; instead, the arrangement can be displaced
continuously over the entire pivot range. This means that the
frictional force of the bearing of the handle cannot be too great
since otherwise a displacement into another work position would not
be possible. On the other hand, this can cause an unwanted
displacement which cannot be avoided such as a displacement
accompanying a larger load or a sudden change in torque.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a handle
arrangement for a handheld portable tool which simplifies
manipulation by the operator and especially makes such manipulation
safer.
The rearward handle arrangement of the invention is for a handheld
portable tool having a motor housing and a forward handle fixedly
attached to the housing so as to permit two-handed operation of the
tool by an operator. The tool defines a horizontal axis and the
rearward handle arrangement includes: a carrier part for attaching
the rearward handle arrangement to the housing of the tool; a
rearward handle; journalling means for rotatably journalling the
rearward handle in the carrier part so as to permit the rearward
handle to rotate about the axis relative to the carrier part and
the forward handle; the carrier part and the rearward handle
conjointly defining an interface; and, unlatchable detent means
disposed at the interface for self-latching the rearward handle to
the carrier part at any one of a plurality of predetermined angular
positions about the axis and corresponding to respective work
positions in which the tool can be held by the operator.
The essential advantages of the invention are seen in that the
rearward handle can always be grasped by the hand independently of
the work position thereby causing the throttle lever and switch to
always be in the same position relative to the hand of the
operator. In addition, an unwanted displacement out of the work
position is prevented by the form-tight interengaging detent means
which is self-latching. The invention is suitable for different
handheld portable tools such as hedge trimmers, cutoff machines,
brushcutters and motor-driven chain saws.
In a preferred embodiment of the invention, the unlatchable detent
means includes a detent pawl journalled on the rearward handle and
this detent pawl has a projection which engages in a corresponding
recess of the carrier part. The detent pawl is resiliently biased
by a spring in the direction of the latched position. The detent
pawl must only be pivoted to unlatch the detent means since the
detent pawl pivots back automatically and latches when reaching the
next work position after a corresponding rotation of the handle in
the carrier part. However, as an alternative, a detent pin can be
provided which is longitudinally displaceable in a bore of the
rearward handle and is pushed in a self-acting manner into a recess
in the carrier part by means of a helical spring.
A safety device is provided to assure that a displacement from one
work position into another work position does not occur while the
portable tool is operating. With the safety device, the detent
means can only be unlatched when the drive motor or portable tool
is at standstill and the rearward handle is rotatable. It is also
an advantage that the throttle lever is actuable only when the
detent means is latched. For portable tools equipped with an
internal combustion engine, it is not necessary to bring the engine
to standstill; instead, it is only necessary to bring the working
tool of the portable tool to standstill and this usually takes
place in that the centrifugal clutch separates the working tool
from the engine at idle speed.
The safety device by means of which a displacement from one work
position into another work position is only possible when the work
tool is at standstill can be configured in a simple manner in that
the throttle lever includes a forward portion defining a path of
movement which crosses over the pivot range of the detent pawl or
the displacement path of a bracket arranged on the detent
wedge.
The rearward handle is advantageously journalled with a
substantially cylindrical extension in an annular portion of the
carrier part. A radial projection is provided at the end of the
extension which engages behind the annular portion. The cylindrical
extension in this way forms a pivot bearing for the carrier part
and the radial projection assures that the extension stays in the
annular portion. The radial projection can, for example, be defined
by a ring which is subsequently put in place or by means of
projections appropriately formed at the end of the extension. To
secure the carrier part on the extension of the rearward handle,
the carrier part can include a transverse bore and an annular slot
in the extension which are configured for accommodating a holding
bolt. Only torsion acts on the throttle fuel line when displacing
the handle because the throttle fuel line is guided coaxially
through the extension and hooked into the throttle lever. Any
change in direction of the course of the throttle fuel line is
precluded.
The handle is preferably made of two handle shells with the
partition plane extending asymmetrically in the direction of the
handle at least in the region of the extension. In this way, a main
segment and a complimentary segment are formed in the extension
which conjointly define a jacket-like surface of the extension
which is essentially cylindrical. In this way, it is possible that
the radial projection can be configured as one piece with the
extension. This projection extends only across a circular arc
section and is arranged at the end of the main segment. The
extension is axially held in the annular portion in this manner
without it being necessary to provide additional components. This
configuration in the form of a circular arc portion further affords
the advantage that the ends of the circular arc segment coact with
stop means arranged on the carrier part to provide a rotational
angle limit with this stop means being annularly formed by an axial
projection. The rotational angle limit assures that the handle is
not rotated several times about the rotational axis which would
otherwise act as a disadvantage for the throttle pull line.
An orthogonally arranged wall is provided in the main segment to
provide form stiffness. This wall further provides a guide opening
for the throttle pull line.
For most handheld portable tools it is completely adequate if the
displacement is possible into three work positions. The detent
means are therefore latchable in three work positions with the work
positions being arranged one next to the other at an angle of
90.degree..
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the drawings
wherein:
FIG. 1 is a schematic of a carrier part having a pivotable handle
and showing the different work positions;
FIG. 2 is a longitudinal section view through the rearward handle
and the carrier part;
FIG. 3 corresponds to FIG. 2 with the throttle lever being fully
depressed;
FIG. 4 is a section view corresponding to those shown in FIGS. 2
and 3 but with the detent pawl unlatched;
FIG. 5 is a section view taken along line V--V of FIG. 4;
FIG. 6 shows the carrier part viewed in the direction of the
rotational axis;
FIG. 7 shows the configuration of the bearing of the handle in the
carrier part;
FIG. 8 shows the assembly process for attaching the handle in the
carrier part;
FIG. 9 is a longitudinal section view through another embodiment of
the rearward handle and of the carrier part which is shown not
mounted;
FIG. 10 is a view of the carrier part along line X--X of FIG.
9;
FIG. 11 is a section view taken along line XI--XI of FIG. 9;
FIG. 12 is a section view taken through the rearward handle showing
the throttle lever fully depressed;
FIG. 13 is a section view taken through the rearward handle with
the, detent wedge unlatched;
FIG. 14 is a view, partially in section, taken along line XIV--XIV
of FIG. 9;
FIG. 15a is a plan view of the detent wedge;
FIG. 15b a front elevation view of the detent wedge; and,
FIG. 15c is a side elevation view of the detent wedge.
DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
In FIG. 1, a carrier part 1 having carrier bearing journals 2 is
shown for a handheld portable tool (not shown). A handle 3 is
pivotally journalled on the carrier part 1 about a rotational axis
4. The handle 3 is disposed in a specific work position. The handle
3 can be pivoted into two additional work positions from the work
position shown as indicated by the arrows 8 and 8'. Reference
numeral 3' identifies the position which the handle assumes when
pivoting in the direction of arrow 8. As shown in FIG. 1, the
handle 3 can assume three different work positions so that the
handheld portable tool can be manipulated in a suitable manner as
required.
FIG. 2 is a longitudinal section through the rearward handle 3 and
the carrier part 1. Three bearing journals 2 are formed on the
carrier part 1 and are provided for attachment to the motor housing
of the handheld portable tool with vibration damping means
connected therebetween. The carrier part 1 has an annular portion 9
wherein the extension 10 of the rearward handle 3 is disposed. The
annular portion 9 and the extension 10 conjointly define a pivot
bearing so that the handle 3 is pivotally journalled in the carrier
part 1 about the rotational axis 4. A throttle lever 11 is mounted
in the rearward handle 3 and is movable into its idle position by a
leg spring 12. A leg 12' in the leg spring 12 braces against a
throttle lever lock 13 which is thereby moved into its initial
position wherein it projects outwardly out of the rearward handle
3.
A stop switch 14 is provided at the upper edge of the handle 3. A
detent pawl 15 is pivotally journalled on the handle 3 on the side
thereof facing toward the carrier part 1 with the detent pawl 15
being biased into a position by a leg spring 16 wherein a
projection 17 formed on the detent pawl 15 engages in a
corresponding recess in the carrier part 1. The throttle lever 11
has a portion 19 at its end facing toward the extension 10 and the
path of movement of the portion 19 is guided along an upper limit
surface 20 with the pivot movement of the throttle lever 11. In
this way, a simultaneous actuation of the throttle lever 11 as well
as the detent pawl 15 is prevented. The unlatching of the detent
pawl is described later with respect to FIG. 4. The axial fixation
of the handle 3 in the carrier part 1 takes place at the one side
by a corresponding shoulder 21 on a radial section 22 of the
carrier part 1 and also on the other side by a radial projection 31
which engages behind the annular portion 9 as shown in FIG. 5.
FIG. 3 likewise shows a longitudinal section through the rearward
handle 3 and the carrier part 1 which corresponds essentially to
FIG. 2 and therefore the reference numerals for FIG. 2 are taken
for the corresponding parts.
FIG. 3 shows the throttle lever lock 13 and the throttle lever 11
in the depressed condition whereby the leg spring 12 is fully
tensioned. A throttle actuating line 24 is hooked into a
corresponding opening 23 in the throttle lever 11. In this position
of the throttle lever 11, the portion 19 of the throttle lever is
also disposed at the limiting surface 20 of the detent pawl 15 so
that an actuation of the detent pawl in this position of the
throttle lever 11 is precluded.
FIG. 4 shows a longitudinal section through the rearward handle 3
with the throttle lever lock 13 as well as the throttle lever 11
disposed in their unactuated initial position. In this position of
the throttle lever 11, the portion 19 is pivoted in the direction
toward the throttle actuating line 24 to the extent that the
arcuate portion 25 on the end of the throttle lever 11 facing the
detent pawl 15 is disposed above the upper limit surface 20 of the
detent pawl 15 and thereby clears the pivot path of the upper limit
surface 20. In this way, the detent pawl 15 can be pivoted against
the force of the spring 16 whereby the projection 17 is lifted out
of the recess 18. With the detent pawl unlatched, the carrier part
1 can be rotated on the extension 10 about the axis 4 so that the
carrier bearings 2 assume a position displaced by 90.degree. with
respect to FIG. 3. FIG. 4 clearly shows that in the unlatched
position of the detent pawl 15, an actuation of the throttle lever
11 is precluded since the upper limit surface of the detent pawl 15
is disposed in the pivot region of the portion 19.
When the handle 3 is pivoted into a specific work position with
respect to the carrier part 1 as shown for example in FIG. 4, then
the detent pawl 15 is released which causes spring 16 to press the
detent pawl into its rest position whereby the projection 17
engages in the recess 18 and forms a lock-tight connection. With
respect to further details, FIG. 4 corresponds to the views already
described in FIGS. 2 and 3 so that the same parts have the same
reference numerals.
FIG. 5 shows a section view taken along line V--V in FIG. 4. This
view shows that the handle 3 comprises a first handle shell 27 and
a second handle shell 28 with the partition plane 29 extending
asymmetrically through this plane in the longitudinal direction of
the handle 3 as well as through the extension 10. The two handle
shells 27 and 28 are held together with threaded fasteners for
which corresponding bores 30 are provided. The throttle lever 11
and the detent pawl 15 are journalled between the first handle
shell 27 and the second handle shell 28. Walls 26 which are
directed orthogonally to the longitudinal axis are provided within
the extension 10 of the first handle shell 27. On the one hand,
these walls assure a stiffness of form of the bearing surfaces and,
on the other hand, function to guide the throttle pull line.
FIG. 5 further shows that a radial projection 31 is formed at the
outermost end of the extension 10. This projection 31 engages
behind the annular portion 9 of the carrier part 1. It is also
noticeable that the annular-shaped portion 9 has an axial
projection 32 (see FIG. 8) on the lower part thereof. This
projection 32 extends into the path of movement of the radial
projection 31 (see FIG. 5) when rotating the handle 3 in the
carrier part 1 and in this way, acts as a stop for limiting a
maximum angular rotation.
FIG. 6 shows the carrier part 1 and the arrangement of the carrier
bearing journals 2. The rotational axis 4 is in the center of the
annular-shaped portion 9 and three recesses 18 are arranged at an
angle of 90.degree. to each other referred to this axis. The
arrangement of the three recesses 18 determines the three work
positions which the handle 3 can assume with respect to the carrier
part 1.
FIG. 7 shows the configuration of the extension 10 which is formed
conjointly by the two handle shells 27 and 28. A main segment 33 is
formed on the first handle shell 27 and has a cylindrical
jacket-like surface over an angle of approximately 150.degree. and
has a tapering contour which faces toward the second handle shell
28 and the complimentary segment 34 formed thereon. The cylindrical
jacket-like surface of the main segment 33 and the cylindrical
jacket-like surface of the complimentary segment 34 thereby
conjointly define the pivot bearing on which the carrier part 1 is
journalled by means of its annular portion 9. The tapering contour
on the main segment 33 is required for the assembly of the handle
shells and therefore for the extension 10 in the carrier part 1.
The radial projection 31 is shown on the main segment 33 and
extends over a circular arc segment.
The illustration of FIG. 8 is intended to make clear the assembly
process of the handle 3 in the carrier part 1. The first handle
shell 27 can be inserted in the direction of the arrow 35 through
the annular-shaped portion 9 because of the configuration of the
main segment 33 shown in FIG. 7. If the main segment 33 is disposed
along its entire length within the annular-shaped portion 9, then a
displacement occurs in the radial direction according to arrow 36
so that the radial projection 31 engages behind the annular portion
9. The second handle shell 28 is then placed against the first
handle shell 27 which already contains the throttle lever, pawls
and springs and this is indicated by the arrow 37. Thereafter, a
longitudinal displacement in the direction of arrow 38 occurs
whereby the complimentary segment 34 engages in the annular-shaped
portion 9 and the extension 10 (FIG. 7) is thereby completed and
this extension 10 defines the pivot bearing for the carrier part 1
as described earlier.
FIG. 9 shows a longitudinal section through a rearward handle 43
and through a carrier part 41 which has not yet been mounted on
handle 43. The carrier part 41 has an annular-shaped portion 49
which can be mounted on an extension 50 of the rearward handle 43.
The annular-shaped portion 49 and the extension 50 define a pivot
bearing so that the handle 43 is pivotally journalled about the
rotational axis 44 on the carrier part 41.
In the mounted condition, a transverse bore 45 of the
annular-shaped portion 49 is in alignment with an annular-shaped
slot 46 of the extension 50. A holding bolt 57 (see FIG. 11)
inserted into the transverse bore 45 holds the carrier part 41 on
the extension 50. On one location of its periphery, the extension
50 has a recess 58 extending in the axial direction and this recess
58 has a slight conical shape into which a forward end of a detent
wedge 55 having the same shape is disposed. The carrier part 41 has
three recesses 47 on the annular-shaped portion 49. The three
recesses are each displaced 90.degree. from each other referred to
the axis 44 and correspond to the mirror image of the recesses 58.
The detent wedge 55 is longitudinally displaceably journalled in a
corresponding bore 42 in the handle 43. The throttle lever 51, the
throttle lever detent 53, the leg spring 52 and the leg 52' thereof
and the stop switch 54 are identical to their counterparts in FIG.
2 with respect to configuration and function. The throttle lever 51
has a portion 59 which is guided along a limit surface 60 of a
bracket 48 formed on the detent wedge 55. The function of these
parts is the same as already described with respect to FIGS. 2 to
4.
FIG. 10 shows the three recesses 47 displaced one from the other by
90.degree. at the edge of the annular-shaped portion 49 of the
carrier part 41.
FIG. 11 shows a section view taken along line XI--XI of FIG. 9 with
the holding bolt 57 seated in the transverse bore 45 of FIG. 9.
FIGS. 12 and 13 show the rearward handle 43 in the full throttle
position (as in FIG. 3) and the idle position (as in FIG. 4),
respectively. FIG. 12 shows that the portion 59 lies in a
form-tight manner against the limit surface 60 of the bracket 48
and thereby prevents an unlatching of the detent wedge 55. In the
idle position of FIG. 13, the portion 59 is disposed in the plane
above the bracket 48 thereby providing the possibility of a linear
displacement of the detent wedge 55 out of the recess 58.
FIG. 14 is a view of the rearward handle 43 taken along the line
XIV--XIV of FIG. 9. A portion of the rearward handle 43 is broken
away in FIG. 14 and shows that the detent wedge 55 is biased by a
helical spring 56 into the latched position. The detent wedge 55
has two arms 61 which project laterally from the rearward handle 43
and on which the operator can push the detent wedge 55 toward the
rear and in FIG. 14 this is toward the left.
FIGS. 15a to 15c show different views of the detent wedge 55 with
FIG. 15b showing the view in the direction of arrow B of FIG. 15a
and 15c shows the detent wedge as seen in the direction of arrow C
of FIG. 15b. The reference numerals in FIGS. 15a to 15c correspond
to those appearing in FIGS. 9 to 14.
It is understood that the foregoing description is that of the
preferred embodiments of the invention and that various changes and
modifications may be made thereto without departing from the spirit
and scope of the invention as defined in the appended claims.
* * * * *